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七十年代初期,我场引进了少量的美国大豆进行试种。为充分发挥其个体的生产力,每亩以不足一万株的密度开行点播。由于当时对豆荚螟的生活习性缺乏认识,造成了虫食率高达90%的惨痛结局。为此,我们对全场2,000亩黄豆(品种为猴子毛)进行了全面调查,结果表明,密度小的田豆荚螟卵量明显重于密度大的田。这说明,豆类螟的成虫产卵有趋向稀疏的习性。真正高密度,长势好,荫蔽大的田却看不到或
In the early seventies, my field introduced a small amount of American soybeans for trial planting. In order to give full play to their individual productivity, on-demand broadcasting is carried out at a density of less than 10,000 plants per mu. The lack of awareness of the habitat of the pod borer at that time caused a painful ending of up to 90% of the worm rate. To this end, we conducted a comprehensive survey of 2,000 acres of soybeans (species of monkey hair), the results showed that the density of the small pods borer was significantly heavier than the density of the field. This shows that the legworm adult spawning habits tend to sparse. Really high density, good growth, shaded fields can not see or